Numbers n such that sigma(n) = phi(prime(n)+1).

Terms

a(0) =23a(1) =51a(2) =77a(3) =87a(4) =114a(5) =154a(6) =158a(7) =184a(8) =210a(9) =308a(10) =552a(11) =690a(12) =786a(13) =1330a(14) =1848a(15) =2030a(16) =2280a(17) =2868a(18) =2976a(19) =3432a(20) =8680a(21) =10290a(22) =11556a(23) =12750a(24) =13110a(25) =26400a(26) =56808a(27) =57960a(28) =62496a(29) =136290